WO1991005595A1

WO1991005595A1 - Method and apparatus for producing hollow yarn film knitted article

Info

Publication number: WO1991005595A1
Application number: PCT/JP1989/001053
Authority: WO
Inventors: Osami Kato; Seiko Ishikana; Tsutomu Iriyama; Tatsujiro Mori
Original assignee: Mitsubishi Rayon Co., Ltd.
Priority date: 1989-10-13
Filing date: 1989-10-13
Publication date: 1991-05-02
Also published as: KR0138507B1; EP0450068A4; KR920702823A; EP0450068A1

Abstract

This invention relates to a hollow yarn film knitted article obtained by disposing at least one warp knitting line consisting of ordinary fiber filaments (8, 8'; 9, 9') with a gap and passing hollow yarn films (11) in a weft direction over and under the stitches of the warp line, and to a production method of the knitted article. The knitted article production apparatus comprises hollow yarn film guide bars (1, 1'; 2, 2') disposed with gaps between them to the right and left and capable of moving up and down; a feed member (10) for supplying the hollow yarn film around the guide bars (1, 1'; 2, 2'), latch needles capable of knitting the hollow yarn film, (3, 3'; 4, 4') capable of moving up and down, and warp supply members (6, 6'; 7, 7') for the latch needles.

Description

Description Manufacturing method and manufacturing apparatus for hollow fiber membrane knitted fabric

The present invention relates to a method for producing a hollow fiber membrane knitted fabric suitable for producing a hollow fiber membrane module used in artificial lung, artificial dialysis, plasmapheresis, pure water production, gas filtration, water purifiers and the like. Fight for manufacturing equipment. Background art

Generally, a hollow fiber membrane module is manufactured by cutting a bundle of hollow fiber membranes into a predetermined length, storing them in a container, and fixing the ends of the hollow fiber membranes to the container with epoxy resin or urethane resin. You. However, if the opening at the end of the hollow fiber membrane is fixed in the open state, the resin enters through the opening and cannot be used as a module. Therefore, a method has been adopted in which the bundle end of the hollow fiber membrane is fixed in a state where it is temporarily sealed with a resin or the like in advance, and after fixing, the fixed part is cut to open the bundle end of the hollow fiber membrane.

Conventionally, there have been problems mainly with regard to processing costs at the time of temporary sealing during module production, reliability of the temporary sealing, disturbance of the bundle of hollow fiber membranes at the time of fixing, and reliability of fixing.

In other words, the temporary sealing part is a part that is discarded when the module is completed, but is an indispensable part in the temporary sealing process. Material costs and processing costs for that purpose had to be extra. In addition, it is difficult to determine whether or not the temporary sealing is performed without any trouble at the time of the temporary sealing, and the quality of the temporary sealing can be determined only by observing the cut surface of the fixed portion after the module is manufactured. Furthermore, since the opening of some hollow fiber membranes may be blocked by the fixing resin, the required membrane area cannot be secured in the module, and the module that has been manufactured must be discarded as a defective product. There are cases.

In addition, in this method, since a method of storing a bundle of hollow fiber membranes in a container is required, it is necessary to tightly align the bundles of hollow fiber membranes and store them in the container. Otherwise, the hollow fiber membrane in the peripheral part is disturbed, and the end of the hollow fiber membrane is buried in the fixing resin. As a result, the hollow fiber membrane cannot be used effectively. Furthermore, since the hollow fiber membranes are used as a bundle, the hollow fiber membranes are often filled relatively densely, and are fixed between the hollow fiber membranes at the center of the hollow fiber membrane bundle during fixing. There is a drawback that the resin does not easily penetrate, and as a result, defective products are easily generated due to improper fixing.

On the other hand, as means for forming the hollow fiber membrane into a bundle, a method of winding the hollow fiber membrane into a total frame such as a tetragon, hexagon, or octagon several tens to several hundred times to obtain a bundle (total) Method). In this method, before cutting to obtain a bundle, it is necessary to bundle the hollow fiber membrane single yarn forming the bundle with paper or thread so that the yarn does not fall apart, and the handling is troublesome.

Furthermore, in this total method, hollow fibers obtained by one total It has problems such as the limited number of membrane bundles and extremely low production efficiency.

Knitted hollow fiber membranes are disclosed in JP-A-62-57965 and JP-A-1-92203. However, these documents do not disclose any specific knitting device or knitting method for processing the hollow fiber membrane into a knit without damaging it. In a normal Russell knitting machine, the interval between the needles that determines the interval for the weft is usually about 1.6, and the upper limit of the weft movement width is about 16. Disclosure of the invention

In view of such a situation, the present inventors have conducted intensive studies on a method of manufacturing a hollow fiber membrane module having no above-mentioned disadvantages, and have reached the present invention.

An object of the present invention is to solve the problems of the prior art and to provide a manufacturing method and an apparatus capable of obtaining a hollow fiber membrane bundle which can be easily processed by a membrane module.

According to the present invention, a hollow fiber membrane supply member traveling on a plane around the hollow fiber membrane guide bar with respect to a pair of vertically movable hollow fiber membrane guide bars standing upright and left at predetermined intervals. A hollow fiber membrane is supplied from the upper part of the lancing needle, and the hollow fiber membrane is endlessly supplied to the lancing needle moving up and down in a region surrounded by the traveling path. Four methods for producing a hollow fiber membrane knitted fabric that is folded and arranged in a state are provided.

In the production method of the present invention, while the hollow fiber membrane supply member It is preferable that the hollow fiber membrane guide bar and the needle are simultaneously moved up and down by two reciprocations.

Further, the movement of the hollow fiber membrane supply member is temporarily stopped to form a knitted portion using only the warp, or the number of the latch needles is set to two or more, and at least one latch needle is used for the other. It is more preferable to supply a warp of a different color from the warp supplied to the lancing needle.

In addition, it is preferable to use a pair of hollow fiber membrane guide bars that are erected on the left and right at least at an interval of 50 mm because a module of an appropriate length can be formed.

An apparatus for manufacturing a knitted hollow fiber membrane according to the present invention comprises: a pair of vertically movable hollow fiber membrane guide bars erected at predetermined intervals on the left and right; and a hollow fiber traveling on a plane around the hollow fiber membrane guide bar. A membrane supply member, a torsion needle that moves up and down in a region surrounded by the traveling path, and a warp supply member that is disposed substantially above the lather needle and supplies a warp to the lather needle. The hollow fiber membrane supply member is configured to move up and down two reciprocations in synchronization with the hollow fiber membrane guide bar and the lever. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic perspective view showing a knitting state of a hollow fiber membrane knitted fabric by a preferred apparatus for carrying out the production method of the present invention, and FIG. 2 is a traveling of a traverse guide viewed from the top of the apparatus shown in FIG. FIG. 3 is a perspective view showing an enlarged main part of the knitting state of FIG. 1, and FIGS. 4 (a) to 4 (d) show the knitting method according to the present invention. FIGS. 5A and 5B are diagrams sequentially explaining the stitch forming process of FIG. FIG. 5 is a plan view corresponding to FIG. 2, showing a state in which the traverse guide travels in a figure eight shape.

FIG. 6 is a schematic diagram of a hollow fiber membrane knit including a knitted fabric portion of warp only, and FIG. 7 is a schematic perspective view of a hollow fiber membrane bundle in which the hollow fiber membrane knit is spirally bundled. BEST MODE FOR CARRYING OUT THE INVENTION

The invention will be described in more detail hereinafter with reference to the accompanying drawings, which show a preferred device for carrying out the method of the invention.

FIG. 1 shows an outline of knitting in a hollow fiber membrane feed production apparatus of the present invention, and FIG. 2 is a plan view of the apparatus shown in FIG. This shows the travel path of the traverse guide.

In FIG. 1, guide bars 1 and 1 'and guide bars 2 and 2' are vertically arranged on the left and right sides of the knitting apparatus at an interval of about 50 to 1000, preferably about 50 to 500 m. It is moved up and down by a driving device (not shown).

Inside the left and right guide bars 1, 1 '; 2, 2', two spatula needles 3, 3 '; 4, 4' are arranged vertically and in the direction of the left and right guide bars. Has been established. Each pair of needles A, 3, 3 '; 4, 4' can be moved up and down along a key formed on a trick plate 5, 5, respectively. , 1 '; Synchronizes with the vertical movement of 2, 2'.

A corresponding number of warp yarns are above each of the needles 3, 3 '; 4, 4'. When the supply guides 6, 6 '; 7, 7' are arranged, and each of the needles 3, 3 '; 4, 4' is at the top dead center position, each hook is turned in a slightly U-shape so as to go around. Move and provide warp 8, 8 '; 9, 9' inside each hook.

Numeral 10 is a traverse guide (hollow) in which one or a plurality of hollow fiber membranes (hereinafter referred to as hollow fiber membrane group), which are constituent elements of the hollow fiber membrane module of the present invention, are provided as weft yarns and guided to warp stitches. The traverse guide 10 travels around the outside of each of the guide bars 1 ', 1; 2, 2' without crossing on a plane as shown by arrows in FIG. That is, the traverse guide 10 wraps around the two guide bars 1 ′, 1 from the point 図面 in the center of the drawing, passes through the hook side of the left hand 3 ′, 3, and wraps around the two guide bars 1, 1. , And around the guide bars 2 and 2 ′ through the non-hook sides of the latch needles 4 and 4 ′ arranged on the right side of the drawing. Run on the hook side of 4 and reach point A above to complete the round.

On the other hand, while the traverse guide 10 is traveling, each of the guide bars 1, 1 '; 2, 2' and each of the needles 3, 3 '; 4, 4' move up and down in synchronization.

The timing will be described with reference to FIG. When traverse guide 10 is located at point A in the center of Fig. 2, guide bars 1, 1'2, 2 'and needles 3, 3'; 4, 4 'are all to the lowest position (bottom dead center). When the traverse guide 10 passes through the tie point A, the guide bars 1, 1 '; 2, 2' and the needles 3, 3 '; 4, 4' start rising and the traverse guide 10 Do When 10 passes through guide bar 1 ', the tips of all guide bars 1, 1'; 2, 2 'are located above the travel plane of traverse guide 10, and thereafter all guide bars 1, 1'; 2 , 2 ′ and all needles 3, 3 ′; 4, 4 ′ continue to rise and reach the highest point (top dead center) at the midpoint B of guide bar 1 ′, 1 on the left. Then, when the traverse guide 10 passes through the intermediate point B, the guide bars 1, 1 '; 2, 2' and the lancing needles 3, 3 '; 4, 4' also start descending, and the traverse guide 10 is moved. It keeps descending until it reaches point C, and becomes the lowest point (bottom dead center) at point C.

Next, from the point when the traverse guide 10 passes through the point C, all the guide bars 1, 1 '; 2, 2' and the spatula needles 3, 3 '; 4, 4' start rising, and the traverse guide 10 When guide 10 passes through guide bar 2, the tips of all guide bars 1, 1 '; 2, 2' are located above the travel plane of traverse guide 10, and thereafter all guide bars 1, 1 '; 2, 2 'and all needles 3, 3'; 4 4 'continue to rise and reach the highest point (top dead center) at the midpoint D of guide bars 1 and 2' on the right. Then, when the traverse guide 10 passes through the intermediate point D, the guide bars 1, 1 '; 2, 2' and the lancing needles 3, 3 '; 4, 4' also start descending, and the traverse guide 10 is moved. It continues descending until it reaches point A, and becomes the lowest point (bottom dead center) at point A.

Therefore, every one turn of the traversing guide 10, all the guides 1, 1 '; 2, 2' and all the needles 3, 3 '; 4, 4' move up and down twice. Become.

In FIGS. 1 and 2, reference numerals 12 and 13 denote left and right hand needles 3, 3 '; 4, Fixed guide guides 12 'and 13' are provided horizontally to protrude from the tips of the fixed guide guides 12 and 13 in order to prevent the sticks from jumping up when 4 'rises. It is a bar-shaped fixed projection bar. The protruding bars 12 'and 13' should cross the upper surface of the trick plate 5 between the left and right hand pins 3, 3 '; 4, 4' and the right and left guide bars 1, 1 '; 2, 2'. It is installed as close as possible to the sticks 3, 3 '; 4, 4'.

In the above configuration, the hollow fiber membrane group 11 supplied from above is moved from the outside to one of the right and left guide bars of the guide bar rising at the same time by the traverse guide 10 running in the left-right direction. It is wound. At this time, the other guide bar is also rising, but is not involved in the guide of the hollow fiber membrane group 11 at all, and the hollow fiber membrane group 11 is replaced by the one guide bar at the next rise. Wrap and guide.

At this time, the needles 3, 3 '; 4, 4' are all at the same time at the top dead center, and the warp supply guides 6, 6, 7 ', 7' are slightly above the plane. The warp yarns 8, 8'9, 9 'are wound around the hooks and supplied in a U-shape.

When the hollow fiber membrane group 11 is wound around one of the guide bars, all the guide bars 1, 1 '; 2, 2' and all the needles 3, 3 '; 4, 4' start descending.

These movements will be specifically described with reference to FIG. Fig. 3 shows the position of the member between the members when the hollow fiber membrane group 11 reaches point p from point C. The curve shown by the two-dot chain line in the figure The line is the traverse guide 10 runway.

Now, when the traverse guide 10 is located at the point C, the right and left guide bars 1, 1 '; 2, 2' and the spatula needles 3, 3 '; 4, 4' are at the lowest position (bottom dead center). When the traverse guide 10 passes through the point C, all the guide bars 1, 1 '; 2, 2' and the latch needles 3, 3 '; 4, 4' start rising. The example in Fig. 3 shows the point at which the traverse guide 10 passes point C and then wraps around the guide bar 2 on the right side from the outside to reach the middle point with the guide bar 2 'on the right rear. . At this point, the hollow fiber membrane group that was drafted by the movement of the traverse guide 10 passing through the arrow A → B-C at the previous stage and wound on the guide bars 1 and 1 ′ on the left side 11 is disengaged from guide bars 1 and 1 ', the part A-B is inserted into the stitch as A'-B', and the part B-C is inserted into the stitch needle 3 and 3 '. The state moves to the hook side and the state is passed over the warp loop formed in the previous stage, and becomes B'-C '. Then, in this figure, the hollow fiber membranes at B'-C'—D are successively wound when the hollow fiber membranes wound on the right traverse guides 2 and 2 'are removed from the guide bar. It is inserted in the stitch. As a result, the hollow fiber membrane group 11 in the uppermost stage is passed over the warp loop formed in the previous stage, and is inserted and knitted into the stitch at the time of forming the warp loop in the next stage.

At the time of forming the stitch, the hollow fiber membrane group 11 wound around the guide bars 2 and 2 'descends together with the guide bars 2 and 2', but the fixed guide guide 13 arranged below the hollow fiber membrane travel path 13 And the fixed protrusion bar 13 '(Fig. 2) prevents the hollow fiber membrane group 11 from descending. Only the guide bars 2 and 2 'are lowered, and the hollow fiber membrane group 11 comes off the guide bars -2 and 2'. At this time, the sticks 3, 3 '; 4 4' also descend to form forceps. Fig. 4 (a) to Fig. 4 (d) show the state of the lancing needle 3 as a representative example. At the top dead center, a warp thread is wound around the hook 14 of the bevel needle 3 by a warp supply guide. At this time, a warp loop 16 formed in the preceding stage is formed below the hanging bevel 15. The hollow fiber membrane group 11 is passed through a space surrounded by the warp 8, the warp loop 16, and the lancing needle 3 wound around the hook 14. Fig. 4 (b) shows the state where the spatula needle 3 descends and the loop 16 formed at the previous stage lifts the spatula 15 and closes the hook 14. At this time, the guide bar also descends and the hollow fiber membrane group Fig. 4 (c) shows the state just before the needle 3 further descends to reach the bottom dead center, and a new warp loop 16 is formed. Fig. 4 shows a state in which the spatula needle 3 is being lifted, and at this time, the next-stage hollow fiber membrane group 11 is passed above the warp loop 16. In this way, a hollow fiber membrane knit is continuously formed. Will be done.

In order to form a knitted fabric, a minimum tension is required for the hollow fiber membrane group 11 which is a weft as well as for the warp yarns 8 and 8 ′; and 9 and 9 ′. A limited tension is also required. These tensions fluctuate somewhat during knitting. In particular, in the apparatus of the present invention, the hollow fiber membrane group 11 comes off from the guide bars 1, 1 '; 2, 2'. At the moment, the tension of the hollow fiber membrane group 11 drops to the maximum. At that moment, the warp tension is applied to the hollow fiber membrane group 11. On the contrary, if the hollow fiber membrane group 11 is not supported by any means, the hollow fiber membrane group 11 will be drawn into the grooves of the trick plates 5, 5 '.

The fixing protrusion bars 12 'and 13' are for preventing the hollow fiber membrane group 11 coming off the left and right guide bars 1, 1 '; 22' from entering the groove of the trick plate 55 '. In order to exert the effect sufficiently, it is preferable that the distance between the fixed protrusion bar 13 'and the key of the trick plate 5 is short.

The height of guide bars 1, 1 ′; 2 2 ′ and spatula needles 3, 3 ′; 4 4 ′ can be set as appropriate depending on the distance between the guide bar and the spatula needle. In order to prevent the hollow fiber membrane group U coming off the bar from coming into contact with the knurled needle, it is usually preferable to set the height of the tip of the knurled needle to be lower than the height of the tip of the guide bar.

As is clear from the above description, the hollow fiber membranes come into contact with each guide bar 11'2, 2 ', the fixed guide guides 12, 13 and the fixed protrusion bars 12'; In order to avoid the damage of the group 11 as much as possible, it is preferable to make the surface of these materials smooth, so that, for example, those made of ceramics can be used.

It is preferable that the plurality of guide bars 1, 1 ′; 2, 2 ′ are arranged so that the hollow fiber membrane group 11 is smoothly removed when the guide bars 1, 1 ′; Therefore, for example, when two pairs of guide bars 1, 1 ′; 2, 2 ′ are arranged on the left and right, as shown in FIG. 2, the guide bars 1, 2 on the near side are changed to the guide bars 1 ′, 2 on the rear. It is better to place it slightly inside.

In the above embodiment, the guide bars 1, 1 ′ ′, 2, 2 ′ are arranged two by two on the left and right. However, basically only one guide bar is required on each of the left and right. There are more than books. However, when arranging the needles one by one on the left and right, it is necessary to secure enough space for the lancet to be placed in the part of the traverse guide 10 that is surrounded by the travel path. Furthermore, in the above embodiment, two spatula needles are arranged on each of the left and right sides, but any number of one or more can be set. In general, when making a wide knitted fabric, it is preferable to increase the number of warps by increasing the number of knurls, and the interval between the knurls is appropriately set. If multiple sets of these mechanisms are juxtaposed in the lateral direction, multiple knitted fabrics can be obtained at the same time. The fixed guides 12 and 13 remove the hollow fiber membrane from the guide bar and jump up the stick of the stick needle. It has the two functions of preventing the occurrence of a problem, and may be a plate-shaped object as shown in FIG. 1 or a rod-shaped object as shown in FIG. In FIG. 2, the side 12a of the fixed guide guide serves to remove the hollow fiber membrane from the guide bar, and the front side Ub prevents the needle from jumping up. In addition, these fixed plan guides 12 and 13 may separate the above two functions, and may be divided into two elements having the respective functions.

As described above, the hollow fiber membrane group 11 comes off the guide bar when the lint needle is in the state shown in Fig. 4 (b), but the distance from the guide bar to the lint needle causes the hollow fiber membrane group 11 to move away from the guide bar. The detached hollow fiber membrane group 11 does not come into direct contact with the lancet needle. Although described above with reference to FIGS. 1 to 4, a structure in which the traverse guide travels on the same plane in a figure eight shape as shown in FIG. 5 may be used. In this case, the traverse guide 10 wraps around the two guide bars 1, 1 ′ from the point E at the center of the drawing, passes through the anti-hook side of the left hand 3, 3 ′, and goes around the two guide bars 1, 1 ′. After traveling on the hook side of 3 ', return to point E again, pass around the two guide bars 2 2' through the anti-hook side of spatula needles 4 and 4 'arranged on the right side of the drawing, and Travel on the hook side of 4 and 4 'to reach the above point E and complete the round.

In the present invention, the knitted hollow fiber membrane is manufactured by the above-described apparatus. However, when the hollow fiber membrane knitted fabric is a continuous knitted fabric, when the knitted fabric is cut to an appropriate length, the hollow fiber membrane near the cut portion is damaged or the knitted fabric near the cut portion is frayed. There is.

In the present invention, in order to solve such a problem, supply of the hollow fiber membrane is stopped when a knitted fabric of a predetermined length is formed, and a knitted fabric of warp only is formed, and then a hollow fiber membrane knitted fabric is formed again. Can be adopted. FIG. 6 shows a knitted hollow fiber membrane obtained by this method, and the length of a portion forming the knitted hollow fiber membrane is shown short for simplification of the drawing. The number of stitches of the knitted fabric consisting of only warp yarns is not particularly limited, but may be usually about 2 to 10.

The supply of the hollow fiber membrane is stopped when a knitted fabric consisting of only warp yarns is formed. At this time, it is preferable that the traverse guide be run on a specific guide bar on either the left or right side. In this way, the knitted fabric consisting of only the warp yarns shown in Fig. 6 was formed. When the Y-Y 'portion is cut, the opening end (cut portion) of the hollow fiber membrane is on the same side, which facilitates the work of manufacturing the membrane module. That is, the cut hollow fiber membrane knit is wound as shown in FIG. 7 and one end or both ends of the hollow fiber membrane bundle are fixed with resin, but since the cut portion of the hollow fiber membrane is on the same side, one end is formed. When only resin is fixed with resin, the cut side is fixed with resin.

In the production of the hollow fiber membrane knitted fabric of the present invention, it is preferable to supply a warp of a color different from that of the warp supplied to at least one other hand. For example, in Fig. 2, if the warp yarns supplied to the spatula needles 3 and 3 'and the spatula needles 4 and 4' are made of different colors, when fabricating the membrane module, the operator will be able to use the color of the warp yarns at both ends. By looking at the side, it is possible to determine the cut portion side (open end side) of the hollow fiber membrane.

As described in detail above, according to the apparatus of the present invention, a continuous hollow fiber membrane knitted product obtained by folding the hollow fiber membrane without being cut at the ear can be obtained extremely efficiently. Also, by appropriately setting the knitting width, a hollow fiber membrane knitted product having an arbitrary width can be easily obtained.

Example 1

The spacing between the left and right guide bars was set to 100, and the number of spatula needles was set to two for each of the left and right. A knitting machine was manufactured by modifying the Russell knitting machine shown in Fig. 13.

As the hollow fiber membrane, a bundle of 16 polyethylene hollow fiber membranes (EHF270T manufactured by Mitsubishi Rayon Co., Ltd.) with an outer diameter is used, and black (for right) and light brown (for left) warps are used. Polyester yarn (300d / 96f) was used.

The movement of the guide bar and the hand was synchronized, and it was moved up and down twice while the traverse guide circulated. The moving speed of the traverse guide was set at 55 reciprocations / min, and the warp tension was set at 25 to 30 s.The knitting device was operated under these conditions, and the traverse guide starting from the left end made 130 traverse guides. This movement was stopped for three reciprocations to form a chain knit consisting of only warp yarns.This operation was then repeated to produce 10 hollow fiber membrane knits formed by 130 reciprocations of the traverse guide, consisting of only warp yarns. The chain stitches (X-X ', Υ-Y' in Fig. 6) were cut.

The knitted hollow fiber membrane obtained in this manner is spirally wound as shown in FIG. 7 and housed in a cylindrical polycarbonate container, one end of which is fixed with an epoxy resin to obtain a membrane area of 0.3. It was fabricated membrane module of m ^2. When a water flow test (after hydrophilization treatment with alcohol) was performed on this membrane module in a leak test, good results were obtained, and it was confirmed that the hollow fiber membrane was not damaged during knitting.

Example 2

The distance between the left and right guide bars is 450 m, the moving speed of the traverse guide is 30 reciprocations Zmin, the number of reciprocations of the traverse guide for one batch is 240 times, and the other conditions are the same as in Example 1. When the hollow fiber membrane knit was manufactured, a hollow fiber membrane fabric without damage was obtained. Industrial applicability

The knitted hollow fiber membrane produced by the method or the apparatus of the present invention is remarkably excellent in handleability as compared with a bundle of hollow fiber membranes obtained by a conventional reeling method. Hollow fiber membrane modules manufactured from this hollow fiber membrane knit are used in fields such as artificial lung, artificial dialysis, plasma pheresis, pure water production, water purifiers, gas filtration, liquid filtration, gas separation, and cell culture. It is possible.

Claims

The scope of the claims

1. With respect to a pair of vertically movable hollow fiber membrane guide bars that are erected at predetermined intervals on the left and right sides, a hollow fiber membrane supply member that travels on a plane around the hollow fiber membrane guide bar is hollow. In addition to supplying a yarn membrane, a warp yarn is supplied to the needle moving up and down in an area surrounded by the traveling path from almost above the needle, and the hollow yarn membrane is in an endless state. A method for producing a hollow fiber knitted fabric that is folded back.

2. The method according to Item 1, wherein the hollow fiber membrane guide bar and the needle are synchronously moved up and down two times while the hollow fiber membrane supply member goes around.

3. The method according to paragraph 1 or paragraph 2, wherein the movement of the hollow fiber membrane supply member is stopped occasionally to form a knitted portion solely by the warp.

4. The number of lapped needles shall be 2 or more, and at least one lapped needle shall be supplied with a warp of a different color from the warp supplied to other lapped needles. The method according to paragraph 2.

5. The method according to paragraph 1 or 2, characterized by using a pair of hollow fiber membrane guide bars erected on the left and right at least 50 mm apart.

6. A pair of vertically movable hollow fiber membrane guide bars vertically erected on the left and right sides, a hollow fiber membrane supply member traveling on a plane through the hollow fiber membrane guide bars, and the traveling A hollow needle that moves up and down in a region surrounded by a road, and a warp supply member that is disposed substantially above the needle and supplies a warp to the needle. While the fiber membrane supply member is in circulation, the hollow fiber membrane guide bar is The hollow fiber membrane knitting production apparatus in which the needle and the needle move synchronously and reciprocate up and down two times.